New York (CNNMoney) – Among the questions about how Mitt Romney would pay for his $5 trillion tax plan is whether he would curb the biggest tax break of all: the largely invisible tax savings workers get when their employer provides health insurance.

The "health care exclusion" applies to the money a company contributes to help pay for an employee's coverage; that money is considered income to the worker, and the IRS treats it as tax-free.

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New York (CNNMoney) - The nature of campaigning is to make promises. The nature of governing makes it hard to keep all those promises. And so do unforeseen events, like recessions.

That may be why even those who broadly favor the kind of tax reform that Mitt Romney is proposing - lower tax rates, fewer tax breaks - worry that his $5 trillion plan might not deliver all that he's promised.

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(CNN) – A new ad released by Mitt Romney's campaign Sunday pushes back against a claim President Barack Obama repeatedly leveled at Wednesday's presidential debate - a claim CNN's Fact Check found to be false.

(CNN) – Mitt Romney detailed with fresh specificity this week how he would pay for large tax cuts he's proposed for all Americans, though his campaign says the suggestions were merely options and not a firm look into what policies he would seek to enact as president.

In the interview with CNN affiliate KDVR on Monday, Romney began by offering the broad strokes of his tax plan that he's been touting for months: lowering rates for all Americans and limiting deductions for higher income tax payers.